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Advent calendar 2015

14 December

What is the only palindromic three digit prime number which is also palindromic when written in binary?

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consecutive numbers arrows symmetry cryptic clues rugby sums dodecagons games median planes binary combinatorics crossnumbers triangle numbers scales expansions cards rectangles means sum to infinity even numbers decahedra routes time partitions clocks spheres fractions gerrymandering surds taxicab geometry division advent dice hexagons perimeter functions shapes axes chocolate range polygons parabolas geometric mean complex numbers regular shapes quadrilaterals digital products pentagons cubics odd numbers grids perfect numbers calculus chess digital clocks the only crossnumber coordinates ellipses doubling lines trigonometry differentiation multiples bases digits triangles remainders products dates circles geometry area prime numbers consecutive integers volume floors graphs shape elections sequences square roots polynomials sport squares star numbers mean books geometric means folding tube maps integration balancing ave irreducible numbers addition number determinants indices people maths palindromes dominos pascal's triangle quadratics probabilty square numbers 3d shapes wordplay matrices cryptic crossnumbers factorials percentages money cube numbers speed angles tournaments multiplication averages algebra logic 2d shapes albgebra coins crosswords christmas numbers tangents chalkdust crossnumber sets factors unit fractions proportion crossnumber tiling integers colouring menace probability

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